Normal cowan



(ModeL) N. OOWAN. Machine for Making Wood-Pulp.-

Patent ed lllkqy gi 1880 INVENTOR WITNESSES ATTORNEY N. PETERS,PNOTO-IJTHOGRAPHER. WASHINGT O v D C UNITED STATES PATENT OFFICE.

NORMAN OOWAN, )F PULASKI, NEW YORK, ASSIGNOR OF ONE-HALF OF HIS RIGHT TOW. F. AUSTIN, OF SAME PLACE.

MACHINE FOR MAKING WOOD PULP.

SPECIFICATION forming part of Letters Patent No. 228,041, dated May 25,1880. Application filed April 22, 1880. (ModeL) To all whom it mayconcern:

Be it known that 1, NORMAN OOWAN, of Pulaski, in the county of Oswegoand State of New York, have invented a new and valuable Improvement inMachines for Making Wood Pulp; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is arepresentation of a side view of myimproved fiber-cutting head. Fig. 2 is a longitudinal sectionthereof,and Fig. 3 is a perspective view of one of its sections.

This invention has relation to improvements in means for reducing woodto a fibrous condition in the manufacture of pulp for papermaking andother purposes; and it consists in a cutting head havingspirally-arranged toothed cutting-blades around a central cone orhearing.

It furthermore consists in a cutter-head composed of sections of toothedspiral blades, the twist or direction of the spirals being alternatelyto the right and left on the said sections, as will be hereinafter morefully set forth.

In the annexed drawings, the letter A designates a shaft or mandrehupouwhich is keyed or otherwise secured the head B. This is composed of abody, a, of cylindrical form, having an axial perforation, o, for thereception of the I mandrel, and in its perimeter a deep spiral groove,b, and of a toothed blade, 0, of spiral form, seated in said groove andsecured in position by means of rivets d.

The body a may be made in two or more sections, and when so constructedthe twist of the spiral groove 1) will be to the right in one section,to the leftin the one next adjoining, and so on. Consequently the spiralof blade 0 is alternately to the right and left. The blades 0 in eachofthe sections of the body may be, if desired, made in two or more piecesin order to their more convenientintroduction into their seats in thebody or hub of the head. The action of these spirally-arranged blades,upon the material is to produce a wood fiber of superior quality forthe manufacture of molded ornaments for furniture and papermakinggenerally, the fiber being unusually long and stringy.

The alternate arrangement of the twist of the blades in each sectionprevents the material operated on from being forced sidewise by thescrew-like action of the teeth.

In my machine I employ the heads in a set or sets of two sections, theteeth of each sec tion being part in a right-threaded spiral and part ina left-threaded spiral, as shown.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. The fiber-cutting head having the spirally-arranged toothedcutting-blade, substair tially as specified.

2. The fiber-cutting head having the cutting-teeth arranged in sectionsof alternate right and left spirals to equalizethe screwlike action ofthe teeth, substantially as specified.

8. The fiber-cutting head having its teeth spirally arranged around acentral body or hub, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

NORMAN COWAN.

Witnesses:

JNo. B. WATSON, EDGAR G. MORRIS.

